Issue link: https://cp.revolio.com/i/488587
THE DATA CENTER JOURNAL | 5 www.datacenterjournal.com power system. e diagram also includes information such as the ratings and size of electrical equipment and circuit conduc- tors, and it shows power sources and downstream switchgear, loads and/or panel boards. Building-maintenance person- nel, electricians and engineers rely on a single-line diagram as a map to guide them around the electrical system, making this schematic essential for documenting, troubleshooting and communicating infor- mation about the electrical system. Depending on the data center, change can be routine, and as a result, the single- line diagram can become outdated very quickly. Should anything change in the data center, the single-line diagram should be updated immediately. Maintain electrical equipment. NFPA 70E 2015 specifies that the equipment owner is responsible for electrical-equipment maintenance and the documentation of that maintenance. To reduce the risk of failure and the subse- quent exposure of employees to electrical hazards, data center managers must now conduct maintenance on electrical equip- ment—and not just overcurrent-protective devices—in accordance with manufactur- ers' instructions or industry-consensus standards. Industry-consensus standards include American National Standards Institute/InterNational Electrical Testing Association Standard for Mainte- nance Testing Specifications (ANSI/NETA MTS), NFPA 70B Recommended Practice for Electrical Equipment Maintenance and IEEE 3007.2 Recommended Practice for the Maintenance of Industrial and Com- mercial Power Systems. Document electrical-equipment maintenance. e results of maintenance activities must be documented, including updating documentation to show that overcurrent- protective devices have been properly maintained, tested and inspected to ad- equately withstand or interrupt available fault current. Calculate arc-flash boundary distance and determine arc-flash protection and PPE requirements. A required arc-flash analysis identi- fies the presence and location of potential hazards and provides information to help select proper PPE. A major change to the latest versions of NFPA 70E dictates that the arc-flash boundary distance must now be calculated for all locations where the voltage is greater than 50 volts and where there is a possibility of performing ener- gized work such as maintenance, diagnos- tics and testing. e distance must be manually calculated through engineering analysis, as opposed to using the tables supplied in the standard, unless the specific task to be performed appears in the tables and